package cn.rkylin.oms.common.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * 时间类型的计算
 *
 * @author Administrator
 */
public class DateUtil {

    /**
     * 计算两个日期之间相差的天数
     *
     * @param smdate 较小的时间
     * @param bdate  较大的时间
     * @return 相差天数
     * @throws ParseException
     */
    public static int daysBetween(Date smdate, Date bdate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        smdate = sdf.parse(sdf.format(smdate));
        bdate = sdf.parse(sdf.format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return Integer.parseInt(String.valueOf(between_days));
    }

    /**
     * 字符串的日期格式的计算
     */
    public static int daysBetween(String smdate, String bdate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        cal.setTime(sdf.parse(smdate));
        long time1 = cal.getTimeInMillis();
        cal.setTime(sdf.parse(bdate));
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return Integer.parseInt(String.valueOf(between_days));
    }

    /**
     * 获取当前时间
     */
    public static String getCurrentDateStr() {
        Date date = new Date();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
        String str = df.format(date);
        return str;
    }

    /**
     * 获取当前日期
     */
    public static String getCurrentDateStr(String pattern) {
        Date date = new Date();
        SimpleDateFormat df = new SimpleDateFormat(pattern);
        String str = df.format(date);
        return str;
    }
    
    /**
     * 给定日期，格式化成“yyyy-MM-dd HH:mm:ss”
     * @param theDate
     * @return
     */
    public static String formatDate(Date theDate) {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String str = df.format(theDate);
        return str;
    }
}
